bun.sh/docs/guides/http/simple.md

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Write a simple HTTP server

This starts an HTTP server listening on port 3000. It responds to all requests with a Response with status 200 and body "Welcome to Bun!".

See Bun.serve for details.

const server = Bun.serve({
  port: 3000,
  fetch(request) {
    return new Response("Welcome to Bun!");
  },
});

console.log(`Listening on ${server.url}`);